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Investments in Unconsolidated Entities (Tables) | 9 Months Ended
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Sep. 30, 2018
Schedule of Equity Method Investments [Line Items] |
Investments in and Advances to Affiliates | The following table presents the carrying values of investments in equity method eligible unconsolidated entities recorded within other long-term investments:
Millions |  | September 30, 2018 |  | December 31, 2017
Equity method eligible private equity securities, at fair value |  | $ | 97.3 |  |  | $ | 58.0 |
Investments, accounted for under the equity method |  | 11.6 |  |  | 4.6 |
Total investments in equity method eligible unconsolidated entities |  | 108.9 |  |  | 62.6 |
Other unconsolidated investments (1) |  | 180.8 |  |  | 146.2 |
Total other long-term investments |  | $ | 289.7 |  |  | $ | 208.8 |
(1) Consists of other long-term investments that are not equity method eligible.
Affiliated Entity |
Schedule of Equity Method Investments [Line Items] |
Equity Method Investments | The following table presents White Mountains’s investments in equity method eligible unconsolidated entities as of September 30, 2018 and December 31, 2017:
|  | Ownership Interest |  |
Investee |  | September 30, 2018 |  | December 31, 2017 |  | Instrument Held
PassportCard (1) |  | 50.0% |  | 50.0% |  | Common shares
DavidShield (1) |  | 50.0% |  | — |  | Common shares
Kudu |  | 49.5% |  | — |  | Units
durchblicker |  | 45.0% |  | 45.0% |  | Common shares
Compare.com |  | 22.1% |  | 22.1% |  | Common shares
Tuckerman Capital Fund III, L.P. |  | 21.8% |  | 21.3% |  | Limited partnership interest

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- Definition Tabular disclosure of investments in and advances to affiliates. Does not include the tabular disclosure of the disaggregation of investments in and advances to affiliates across legal entities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 6 -Subparagraph (SX 210.12-14) -URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611322-123010 + Details
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